深宇宙追跡技術グループ

研究キーワード

電波天文学 ,Radio Astronomy

研究分野

自然科学一般 / 天文学 /

経歴

1991年

-

1992年

学術振興会特別研究員

1991年

-

1992年

Researcher in Japan Society for the Promotion of Science

1992年

- 文部省宇宙科学研究所助手

1992年

- The Institute of Space and Astronautical Science

学歴

-

1991年

東京大学理学系研究科天文学

-

1991年

東京大学

-

1986年

東京大学理学部天文学

-

1986年

東京大学

論文

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The Hitachi and Takahagi 32 m radio telescopes: Upgrade of the antennas from satellite communication to radio astronomy

Yoshinori Yonekura Yu Saito Koichiro Sugiyama Kang Lou Soon Munetake Momose Masayoshi Yokosawa Hideo Ogawa Kimihiro Kimura Yasuhiro Abe Atsushi Nishimura Yutaka Hasegawa Kenta Fujisawa Tomoaki Ohyama Yusuke Kono Yusuke Miyamoto Satoko Sawada-Satoh Hideyuki Kobayashi Noriyuki Kawaguchi Mareki Honma Katsunori M. Shibata Katsuhisa Sato Yuji Ueno Takaaki Jike Yoshiaki Tamura Tomoya Hirota Atsushi Miyazaki Kotaro Niinuma Kazuo Sorai Hiroshi Takaba Kazuya Hachisuka Tetsuro Kondo Mamoru Sekido Yasuhiro Murata Naomasa Nakai Toshihiro Omodaka

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 68(5) 2016年10月

The Hitachi and Takahagi 32 m radio telescopes (former satellite communication antennas) were so upgraded as to work at 6, 8, and 22 GHz. We developed the receiver systems, IF systems, back-end systems (including samplers and recorders), and refer...

DETERMINATION OF CENTRAL ENGINE POSITION AND ACCRETION DISK STRUCTURE IN NGC 4261 BY CORE SHIFT MEASUREMENTS

Takafumi Haga Akihiro Doi Yasuhiro Murata Hiroshi Sudou Seiji Kameno Kazuhiro Hada

The Astrophysical Journal 807(1) 15-15 2015年6月

Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. I. VLBI images of the first epoch of observations

Kenta Fujisawa Koichiro Sugiyama Kazuhito Motogi Kazuya Hachisuka Yoshinori Yonekura Satoko Sawada-Satoh Naoko Matsumoto Kazuo Sorai Munetake Momose Yu Saito Hiroshi Takaba Hideo Ogawa Kimihiro Kimura Kotaro Niinuma Daiki Hirano Toshihiro Omodaka Hideyuki Kobayashi Noriyuki Kawaguchi Katsunori M. Shibata Mareki Honma Tomoya Hirota Yasuhiro Murata Akihiro Doi Nanako Mochizuki Zhiqiang Shen Xi Chen Bo Xia Bin Li Kee-Tae Kim

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 66(2) 31 2014年4月 [査読有り]

Very-long-baseline interferometry (VLBI) monitoring of the 6.7 GHz methanol maser allows us to measure the internal proper motion of maser spots and therefore study the gas motion around high-mass young stellar objects. To this end, we have begun ...

Rotating and infalling motion around the high-mass young stellar object Cepheus A-HW2 observed with the methanol maser at 6.7 GHz

K. Sugiyama K. Fujisawa A. Doi M. Honma H. Kobayashi Y. Murata K. Motogi K. Niinuma H. Ogawa K. Wajima S. Sawada-Satoh S. P. Ellingsen

ASTRONOMY & ASTROPHYSICS 562 82 2014年2月 [査読有り]

Context. Proper motion observations of masers can provide information on dynamic motions on scales of a few milliarcseconds per year (mas yr(-1)) at radii of 100-1000 au scales from central young stellar objects (YSOs).
Aims. The 6.7 GHz methanol ...

Multifrequency VLBI observations of the broad absorption line quasar J1020+4320: Recently restarted jet activity?

Akihiro Doi Yasuhiro Murata Nanako Mochizuki Hiroshi Takeuchi Keiichi Asada Takayuki J. Hayashi Hiroshi Nagai Katsunori M. Shibata Tomoaki Oyama Takaaki Jike Kenta Fujisawa Koichiro Sugiyama Hideo Ogawa Kimihiro Kimura Mareki Honma Hideyuki Kobayashi Shoko Koyama

Publications of the Astronomical Society of Japan 65(3) 2013年6月

This paper reports on very-long-baseline interferometry observations of the radio-loud broad absorption line (BAL) quasar J1020+4320 at 1.7, 2.3, 6.7, and 8.4 GHz using the Japanese VLBI network (JVN) and European VLBI network (EVN). The radio mor...